Magnetic mirror machine
A magnetic mirror machine ( 2100; 2200; 3100; 3200 ) for plasma confinement comprises a plurality of longitudinally disposed superconductor coils ( 2104, 2105, 2106 a, 2106 b ) arranged for producing an open-field-line plasma confinement area ( 2106 ), said plasma confinement area ( 2106 ) at each of two ends being limited by a respective mirror area ( 2108 ) of increased magnetic flux density relative to a central area ( 2110 ) of said plasma confinement area ( 2106 ), wherein a superconductor coil ( 2105, 2106 a, 2106 b ) of said of plurality of superconductor coils is located adjacent to said mirror area ( 2108 ) and said superconductor coil ( 2105, 2106 a, 2106 b ) of has a cross-section, in a plane intersecting a magnetic field line ( 2112 ) through said mirror area, having an elongate shape in a direction along said magnetic field line ( 2112 ).
1 . A magnetic mirror machine for plasma confinement, comprising a plurality of longitudinally disposed superconductor coils arranged for producing an open-field-line plasma confinement area, said plasma confinement area at each of two ends being limited by a respective mirror area of increased magnetic flux density relative to a central area of said plasma confinement area, wherein a superconductor coil of said plurality of superconductor coils is located adjacent to said mirror area and said superconductor coil has a cross-section, in a plane intersecting a magnetic field line through said mirror area, having an elongate shape in a direction along said magnetic field line, wherein at least one superconductor coil of said plurality of superconductor coils is embedded in a respective ferromagnetic shielding, thereby focusing magnetic flux in said mirror area and providing a higher mirror ratio relative to an absence of said ferromagnetic shielding.
2 . The magnetic mirror machine of claim 1 , wherein a perimeter segment of said cross-sectional area directed towards said mirror area is convex as seen from outside said perimeter segment.
3 . The magnetic mirror machine of claim 1 , wherein a perimeter segment of said cross-sectional area directed away from said mirror area is concave as seen from outside said perimeter segment.
4 . The magnetic mirror machine of claim 1 , wherein a perimeter segment of said cross-sectional area directed towards said mirror area runs parallel to a perimeter segment of said cross-sectional area directed away from said mirror area.
5 . The magnetic mirror machine of claim 1 , wherein said plurality of superconductor coils are disposed co-axially and longitudinally spaced and each arranged for carrying respective currents in a same direction.
6 . The magnetic mirror machine of claim 1 , wherein said plurality of superconductor coils comprises: a first magnet system comprising a first plurality of concentrically arranged circular-loop superconductor coils, comprising: a first superconductor coil arranged to carry a current in a first direction; and a second superconductor coil arranged to carry a current in a second direction opposite to said first direction; and a second magnet system comprising a second plurality of concentrically arranged circular-loop coils, arranged with mirror symmetry with respect to said first magnet system relative to a symmetry plane (P) located between said first magnet system and said second magnet system.
7 . The magnetic mirror machine of claim 6 , wherein said plurality of superconductor coils further comprises a third magnet system arranged radially outside said plasma confinement area, said third magnet system comprising at least one superconductor circular-loop coil.
8 . A fusion reactor comprising the magnetic mirror machine of claim 1 .
9 . A method of plasma confinement, comprising use of the magnetic mirror machine of claim 1 for confining a plasma.
10 . The method of claim 9 , wherein the method is carried out in a fusion reactor.